As people comments arrive i try to fix things they find also i feel some urge to polish it a little bit here and there. So i have added mouse/touche controls so it can be played on mobile devices. I also added some small improvements to level menu. Also i have added counter for number of steps required for finishing level an i will ad lead boards for them when i find a little more time.

People also gave me idea on undo move but im not sure if that wont lower the difficulty too much. I would rather give something like 3 lives per level that make reverse state to pre dead obstacle position.